Ad Server and Syndication System

1. An ad server system, comprising: a database that stores ads for providers of product-related services such that at least some of the ads are stored in association with a corresponding product descriptor that describes one or more products to which the respective ad corresponds, the product descriptors being separate from the ads, wherein at least some of the ads are additionally stored within the database in association with ad category descriptors that specify types of product-related services to which such ads correspond; and an ad server comprising computer hardware, the ad server operative to: use the associations between the ads and the product descriptors to select ads from the database, the ads being limited to ads for product-related services associated with a product, use the ad category descriptors to filter out ads falling outside a pre-selected set of service categories for a given web page, and output the ads for display on one or more web pages related to the product.

2. The system of claim 1 , wherein each product descriptor corresponds to a particular node of a browsable product hierarchy in which products are arranged by category.

3. The system of claim 1 , wherein the ad server selects ads at least in part by analyzing the one or more web pages to identify a product or product category to which the one or more web pages correspond.

4. The system of claim 3 , wherein the ad server selects ads based at least in part on product information embedded within ad request coding of the one or more web pages.

5. The system of claim 1 , further comprising an ad generation application that provides a user interface and associated functionality for a provider of a product-related service to generate an ad for the product-related service, and to associate the ad with a product descriptor by selecting a desired product or product category from a browsable product hierarchy in which products are arranged within multiple levels of product categories.

6. The system of claim 5 , wherein the ad generation application further provides a user interface and associated functionality for the provider of the product-related service to assign the ad to one of a preexisting set of ad categories associated with the selected product or product category, said ad categories including categories of product-related services.

7. The system of claim 1 , further comprising an ad hosting application that provides functionality for a web site operator to select types of ads to host on a selected web page by selecting a product or product category from a browsable product hierarchy, and by selecting from a corresponding set of ad categories associated with the selected product or product category, said ad categories including categories of product-related services.

8. The system of claim 1 , wherein the database additionally stores ads for products, and the ad server inhibits an ad for a first product from being displayed on a web page that describes the first product.

9. An ad server system, comprising: a database that stores ads for providers of product-related services such that at least some of the ads are stored in association with a corresponding product descriptor that describes one or more products to which the respective ad corresponds, the product descriptors being separate from the ads; and an ad server comprising computer hardware, the ad server operative to: use the associations between the ads and the product descriptors to select ads from the database, the ads being limited to ads for product-related services associated with a product, wherein the ad server selects ads at least in part by analyzing one or more web pages to identify a product or product category to which the one or more web pages correspond, and wherein the ad server selects ads based at least in part on product information embedded within ad request coding of the one or more web pages, and output the ads for display on one or more web pages related to the product.

10. The system of claim 9 , wherein each product descriptor corresponds to a particular node of a browsable product hierarchy in which products are arranged by category.

11. The system of claim 9 , wherein at least some of the ads are additionally stored within the database in association with ad category descriptors that specify types of product-related services to which such ads correspond, wherein the ad server uses the ad category descriptors to filter out ads falling outside a pre-selected set of service categories for a given web page.

12. The system of claim 9 , further comprising an ad generation application that provides a user interface and associated functionality for a provider of a product-related service to generate an ad for the product-related service, and to associate the ad with a product descriptor by selecting a desired product or product category from a browsable product hierarchy in which products are arranged within multiple levels of product categories.

13. The system of claim 12 , wherein the ad generation application further provides a user interface and associated functionality for the provider of the product-related service to assign the ad to one of a preexisting set of ad categories associated with the selected product or product category, said ad categories including categories of product-related services.

14. The system of claim 9 , further comprising an ad hosting application that provides functionality for a web site operator to select types of ads to host on a selected web page by selecting a product or product category from a browsable product hierarchy, and by selecting from a corresponding set of ad categories associated with the selected product or product category, said ad categories including categories of product-related services.

15. The system of claim 9 , wherein the database additionally stores ads for products, and the ad server inhibits an ad for a first product from being displayed on a web page that describes the first product.